Passat servicing help and advice

[pau1200]

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1. I’ve had Passat b8 2015 tdi (engine model CRL) for 3 years now and she is just about to hit 40k miles. She is due a service and I’ve always done main dealer but they say it needs a service, dsg oil change and cam belt. I’m not arguing with any of that but is it time to stop using main dealer.
   What effect will it have on resale if it’s not main dealer?
   My brother is a Honda tech (20+ year exp) and is happy to do the work obviously no book stamp but will use genuine parts and keep receipts. He has asked me to find out some info first though. When changing dsg oil do you need ve diagnostics to put it into a service mode or is it a simple drain replace filter and fill? Second what specialist tools are needed for the cam belt change.
   
   I guess a third would be I’m in the Halesowen area, if advised to go to a garage can anyone recommend a vag specialist that would be cheaper than main dealer.
   
   Thanks